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555+mosfet+ignition coil ignition

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: starman » Tue Jul 14, 2009 9:59 am

Copperboy wrote:Starman;
Perhaps ;) At least now I have the posibility! At a 10x mix the sparklenght could be set at 5mm, assuming the spark is 50mm in the open. Have i got it right? :P

You won't need a 5 mm gap to get the job done in a 10x hybrid. You should think along the lines of a spark plug gap.
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Unread postAuthor: Copperboy » Wed Jul 15, 2009 3:21 am

Maybe I don't need it, but it would draw less current. But yeah, 5mm is a bit overkill.
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Unread postAuthor: Technician1002 » Thu Jul 16, 2009 11:19 am

Copperboy wrote:Maybe I don't need it, but it would draw less current. But yeah, 5mm is a bit overkill.

To save power, but still have a long powerful spark, simply reconfigure the 555 timer as a monostable multivibrator and trigger it for single shots. Have the on time in the same range as before and you are good to go.
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